perf: 大页面量体验优化（#68）

src/hooks/useLoadSlides.ts

@@ -0,0 +1,30 @@
+import { ref, onMounted, onUnmounted } from 'vue'
+import { storeToRefs } from 'pinia'
+import { useSlidesStore } from '@/store'
+
+export default () => {
+  const { slides } = storeToRefs(useSlidesStore())
+
+  const timer = ref<number | null>(null)
+  const slidesLoadLimit = ref(50)
+
+  const loadSlide = () => {
+    if (slides.value.length > slidesLoadLimit.value) {
+      timer.value = setTimeout(() => {
+        slidesLoadLimit.value = slidesLoadLimit.value + 20
+        loadSlide()
+      }, 600)
+    }
+    else slidesLoadLimit.value = 9999
+  }
+
+  onMounted(loadSlide)
+
+  onUnmounted(() => {
+    if (timer.value) clearTimeout(timer.value)
+  })
+
+  return {
+    slidesLoadLimit,
+  }
+}

src/views/Editor/Thumbnails/index.vue

@@ -35,8 +35,8 @@
           @mousedown="$event => handleClickSlideThumbnail($event, index)"
           v-contextmenu="contextmenusThumbnailItem"
         >
-          <div class="label">{{ fillDigit(index + 1, 2) }}</div>
+          <div class="label" :class="{ 'offset-left': index >= 99 }">{{ fillDigit(index + 1, 2) }}</div>
-          <ThumbnailSlide class="thumbnail" :slide="element" :size="120" />
+          <ThumbnailSlide class="thumbnail" :slide="element" :size="120" :visible="index < slidesLoadLimit" />
         </div>
       </template>
     </Draggable>
@@ -52,6 +52,7 @@ import { ContextmenuItem } from '@/components/Contextmenu/types'
 import { VIEWPORT_SIZE } from '@/configs/canvas'
 import useSlideHandler from '@/hooks/useSlideHandler'
 import useScreening from '@/hooks/useScreening'
+import useLoadSlides from '@/hooks/useLoadSlides'
 
 import Draggable from 'vuedraggable'
 import ThumbnailSlide from '@/views/components/ThumbnailSlide/index.vue'
@@ -72,6 +73,8 @@ export default defineComponent({
     const { slides, slideIndex } = storeToRefs(slidesStore)
     const { ctrlKeyState, shiftKeyState } = storeToRefs(keyboardStore)
 
+    const { slidesLoadLimit } = useLoadSlides()
+
     const selectedSlidesIndex = computed(() => [..._selectedSlidesIndex.value, slideIndex.value])
 
     const presetLayoutPopoverVisible = ref(false)
@@ -249,6 +252,7 @@ export default defineComponent({
       slideIndex,
       selectedSlidesIndex,
       presetLayoutPopoverVisible,
+      slidesLoadLimit,
       createSlide,
       createSlideByTemplate,
       setThumbnailsFocus,
@@ -340,6 +344,11 @@ export default defineComponent({
   width: 20px;
   cursor: grab;
 
+  &.offset-left {
+    position: relative;
+    left: -4px;
+  }
+
   &:active {
     cursor: grabbing;
   }

src/views/Screen/SlideThumbnails.vue

@@ -11,7 +11,7 @@
         :key="slide.id"
         @click="turnSlideToIndex(index)"
       >
-        <ThumbnailSlide :slide="slide" :size="150" />
+        <ThumbnailSlide :slide="slide" :size="150" :visible="index < slidesLoadLimit" />
       </div>
     </div>
   </div>
@@ -21,6 +21,7 @@
 import { defineComponent, PropType } from 'vue'
 import { storeToRefs } from 'pinia'
 import { useSlidesStore } from '@/store'
+import useLoadSlides from '@/hooks/useLoadSlides'
 
 import ThumbnailSlide from '@/views/components/ThumbnailSlide/index.vue'
 
@@ -38,11 +39,14 @@ export default defineComponent({
   setup(props, { emit }) {
     const { slides, slideIndex } = storeToRefs(useSlidesStore())
 
+    const { slidesLoadLimit } = useLoadSlides()
+
     const close = () => emit('close')
 
     return {
       slides,
       slideIndex,
+      slidesLoadLimit,
       close,
     }
   },

src/views/Screen/index.vue

@@ -27,6 +27,7 @@
             width: slideWidth + 'px',
             height: slideHeight + 'px',
           }"
+          v-if="Math.abs(slideIndex - index) < 2"
         >
           <ScreenSlide 
             :slide="slide" 

src/views/components/ThumbnailSlide/index.vue

@@ -12,6 +12,7 @@
         height: VIEWPORT_SIZE * viewportRatio + 'px',
         transform: `scale(${scale})`,
       }"
+      v-if="visible"
     >
       <div class="background" :style="backgroundStyle"></div>
       <ThumbnailElement
@@ -21,6 +22,7 @@
         :elementIndex="index + 1"
       />
     </div>
+    <div class="placeholder" v-else>加载中 ...</div>
   </div>
 </template>
 
@@ -48,6 +50,10 @@ export default defineComponent({
       type: Number,
       required: true,
     },
+    visible: {
+      type: Boolean,
+      default: true,
+    },
   },
   setup(props) {
     const { viewportRatio } = storeToRefs(useSlidesStore())
@@ -81,4 +87,11 @@ export default defineComponent({
   background-position: center;
   position: absolute;
 }
+.placeholder {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
 </style>